Water → 1-benzenesulfonyl-4-trifluoromethyl-1H-indole

HRID 913487Notes

Reaction equation

HRID 913487 reaction equation
[F:1][C:2]([F:13])([F:12])[C:3]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:4]=1[CH:5]=[CH:6][NH:7]2.[C:14]1([S:20](Cl)(=[O:22])=[O:21])[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.[OH-].[Na+].O>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.C1(C)C=CC=CC=1>[C:14]1([S:20]([N:7]2[C:8]3[C:4](=[C:3]([C:2]([F:1])([F:12])[F:13])[CH:11]=[CH:10][CH:9]=3)[CH:5]=[CH:6]2)(=[O:22])=[O:21])[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1

Participants

7

Reactant 4

HCID 962WaterHCID 7369Benzenesulfonyl chlorideHCID 14798Sodium HydroxideHCID 198037034-(Trifluoromethyl)-1H-indole

Product 1

HCID 578003941-benzenesulfonyl-4-trifluoromethyl-1H-indoleYield 82%

Reagents, catalysts & solvents 2

HCID 74236Tetrabutylammonium BromideCatalystHCID 1140TolueneSolvent

Procedure

To a solution of 4-(trifluoromethyl)-1H-indole (0.535 g, 2.89 mmol; step A above), tetrabutylammonium bromide (0.097 g, 0.30 mmol) and benzenesulfonyl chloride (0.44 mL, 3.5 mmol) in PhMe (5 mL) at rt was added 50 wt % NaOH (3 mL) and H2O (2 mL). The mixture was stirred 30 min, partitioned between Et2O/H2O and the layers were separated. The organic layer was washed (H2O, brine), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash chromatography (EtOAc/hexanes), affording 0.771 g of the title compound as a thick, pale yellow oil: 1H NMR (300 MHz, methanol-d4) δ 8.25 (d, J=8.3 Hz, 1H), 8.00-7.94 (m, 2H), 7.88 (d, J=3.8 Hz, 1H), 7.65-7.58 (m, 1H), 7.57-7.41 (m, 4H), 6.87 (br. s, 1H).

Workup

  1. custompartitioned between Et2O/H2O
  2. customthe layers were separated
  3. washThe organic layer was washed (H2O, brine)
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customThe residue was purified by flash chromatography (EtOAc/hexanes)

Sources & evidence

ORD record
ord-94e027388eab45089c086e00acfb0296
Source dataset
uspto-grants-2011_09
Patent number
US08026262B2

Reaction notes

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